8Wasley LC, Tinony G, Murtha P. The importance of N - and 0 - linked oligosaccharides for the biosynthesis and in vitro and in vivo biologic activities of erythropoietin. Blood, 1991,77 (12) :2624.
9Hayakawa T, Wada M, Mizuno K, et al. Simple in vivo bioassay with- out radioisotopes for recombinant human erythrooietins. Biologicals, 1992,20(4) :243.